TY - JOUR
T1 - Tuning the microstructure, martensitic transformation and superelastic properties of EBF3-fabricated NiTi shape memory alloy using interlayer remelting
AU - Li, Binqiang
AU - Wang, Liang
AU - Wang, Binbin
AU - Li, Donghai
AU - Oliveira, J. P.
AU - Cui, Ran
AU - Yu, Jianxin
AU - Luo, Liangshun
AU - Chen, Ruirun
AU - Su, Yanqing
AU - Guo, Jingjie
AU - Fu, Hengzhi
N1 - Funding Information:
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50025%2F2020/PT#
This work was supported by the National Natural Science Foundation of China (Grant no. 51871075 , 52171034 , and 52101037 ), Heilongjiang Postdoctoral Fund (Grant no. LBH-Z20139 ) and the Foundation of National Key Laboratory for Precision Hot Processing of Metals ( JCKYS2022603C003 ).
JPO acknowledges Fundação para a Ciência e Tecnologia (FCT - MCTES) for its financial support via the project UID/00667/2020 (UNIDEMI).
Publisher Copyright:
© 2022 The Authors
PY - 2022/8
Y1 - 2022/8
N2 - In this work, different interlayer remelting strategies are applied to regulate the microstructure evolution, martensitic transformation, and superelastic features of NiTi shape memory alloys prepared using the EBF3 additive manufacturing technique. The NiTi deposits prepared under different remelting beam currents are all composed of the B2 austenite, residual B19′ martensite, and submicron-scale Ti4Ni2Ox precipitates, and exhibit a one-step phase transformation (B2 ↔ B19′). Meanwhile, the crystallographic orientation, grain boundaries, and residual strain of these alloys present a distinct variation with the application of different remelting beam currents. During mechanical testing, the critical stress (σMs) of the EBF3-fabricated NiTi alloys was seen to possess a significant dependence on the martensitic transformation behavior, namely with the amount of B19′ martensite and the corresponding Ms. However, the broadening and stabilization of lamellar martensite created by dislocation pile-ups and plastic deformation in the cyclic loading–unloading procedure is the key reason for the deterioration of the superelastic response of the NiTi deposits. This work confirms that the mechanical and functional performances of NiTi alloys produced via EBF3-technique can be modified upon the application of proper interlayer remelting strategies, which can be extrapolated to the directed energy deposition of shape memory alloys or other metal components.
AB - In this work, different interlayer remelting strategies are applied to regulate the microstructure evolution, martensitic transformation, and superelastic features of NiTi shape memory alloys prepared using the EBF3 additive manufacturing technique. The NiTi deposits prepared under different remelting beam currents are all composed of the B2 austenite, residual B19′ martensite, and submicron-scale Ti4Ni2Ox precipitates, and exhibit a one-step phase transformation (B2 ↔ B19′). Meanwhile, the crystallographic orientation, grain boundaries, and residual strain of these alloys present a distinct variation with the application of different remelting beam currents. During mechanical testing, the critical stress (σMs) of the EBF3-fabricated NiTi alloys was seen to possess a significant dependence on the martensitic transformation behavior, namely with the amount of B19′ martensite and the corresponding Ms. However, the broadening and stabilization of lamellar martensite created by dislocation pile-ups and plastic deformation in the cyclic loading–unloading procedure is the key reason for the deterioration of the superelastic response of the NiTi deposits. This work confirms that the mechanical and functional performances of NiTi alloys produced via EBF3-technique can be modified upon the application of proper interlayer remelting strategies, which can be extrapolated to the directed energy deposition of shape memory alloys or other metal components.
KW - Interlayer remelting
KW - Martensitic transformation
KW - NiTi deposits
KW - Plastic deformation
KW - Superelasticity
UR - http://www.scopus.com/inward/record.url?scp=85132916645&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2022.110886
DO - 10.1016/j.matdes.2022.110886
M3 - Article
AN - SCOPUS:85132916645
SN - 0261-3069
VL - 220
JO - Materials & Design
JF - Materials & Design
M1 - 110886
ER -